Rotary brake mechanism.



W, COLLINS. ROTARY BRAKE MECHANISM. APPLICATION IILBD MAR. 17, 1913. T

1,102,325, Patented July'7,1914.

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Unrran strains Parana. orrros.

wnmramzconmns, or BOSTON, MAssAcHUsE'rrs.

ROTARY BRAKE MECHANISM.

Specification of Letters Patent.

Patented J uly '7, 1914.

Boston, in the county of Suffolk and State of Massachusetts, have invented new and Improvements in Rotary Brake which the following is a specification.

This invention relates to rotary brake mechanisms, the object being to provide a carrier provided with one or more pistons and a. casin within which said carrier is arranged. T is eas ing is provided with a chamber arranged outside of and adjacent to a portion of the periphery of said carrier andv as either the casing or said carrier, preferably the latter, is rotated relatively to the other, said pistons are adapted to be moved from a position inside of the periphery of said carrier to project laterally therefrom as said pistons are passing through said chamber to cause the air or liquid contained in said chamber to'be compressed or forced from one side of said piston to the other, and thereby re tard orcheck the movement of one of said members relatively to the other.

The object is further to provide means adapted to cause said pistons to project lat-,

erally from said carrier Within the confines of said chamber to a greater or less predetermined degree;

The invention consists in the combination and arrangement of parts whereby the above objects and certain other objects hereinafter appearing are attained, as set forth in the following specification and particularly pointed out in the claims.

Referring to the drawings: Figure 1 is a transverse section through a brake mechanism embodying my invention. Fig. 2 is a section partly in elevation taken on line 2-2 of Fig. 1 as viewed in thedirection of the arrows on said line, parts of said mechanism being broken away to save space.

Like numerals refer to like parts throughout both views of the drawings.

In the drawings, 4 is a piston carrier, preferably c lindrical in shape, and 5 is a casing Wit in which said piston carrier is mounted upon a shaft 6 which is journaled in suitable bearings. 7 arranged at opposite ends of the casing 4. A portion ofthe inner wall of the casing 5 is arranged concentric with the carrier 4 and is adapted to sub- 4 stantially engage the periphery 8 of said carrier. This portion preferably extends from a point a in the direction of thearrow 1), Fig. 1, to the point 0 substantially diametrically opposite said point The remaining portion of the casin r 5 is offset or in other words the inner wal i 9 thereof is ecccntrically arranged relatively to the carrier 4 and forms a crescent shaped chamber 10 between the periphery 8 of the carrier sand the wall 9.

The chamber 10 is filled with a suitable fluid preferably oil and as either said casing or said carrier, preferably the latter, is rotated relatively to the other more or less of the oil contained within said chamber will be carried around therewith and lubricate the same permitting said-carrier to be rotated freely and without resistance. The carrier 4 is provided with one or more pistons 11 which are preferably slidably arranged in radially disposed slots 12 and are carried around with said carrier during the rotation thereof. v

The pistons 11 during the normal operation of the device are retained in the positions illustrated in 1* ig. 1, that is with their outer ends either within or substantially alining with the periphery 8 and therefore creating no resistance against said carrier 4:, said pistons being yieldingly retained in such positions preferably b springs 13, which are inserted through sibts 14 in said pistons and engage the inner wall 15 of the piston carrier 4. When'it is desired to check the relative movement between the carrier l of. the moving parts and as to whether it is desired to entirely check the rotations thereof or merely retard the same. Means are provided for moving said pistons radially relatively to said carrier at, said means preferably consisting of an expansible cylindrical member 16 which is arranged within said casing 5 and within the recess 17 formed in said carrier 4, substantially concentric with said carrier. Said cylindrical member 16 comprises two parts 18 and 19, the part 18 is preferably a stationary member and is secured to the casing 53, while the member 19 is arranged to slide on said memof said her 18 and to be guided thereon by members 20 which extend longitudinally of said cylindrical member.

hlany means may be employed for expanding and contracting the cylindrical member 16, or in other words, to move the 'member 19 relatively to the member 18, but

as'a convenient and inexpensive expedient,

' I have provided a collar 21 loosely mounted 27 arranged to slide longitudinally of the shaft 6, said sleeve being arranged in non-.

rotatable relation to the end wall 28 adjacent thereto. The portion of said sleeve which projects through said end -wall is preferably square and extends somewhat beyond said end wall and constitutes a bearing for .the shaft 6. TA flange 29 is formed upon said sleeve upon either end thereof within said casingand is adapted to engage the inner wall of the end plate 28 to limit the movement of saidsleeve toward said casing. It is essential that means be provided to normally retain said expansible member 16 contracted and for this purpose a spring 30 is provided which is coiled about the shaft 6, engaging at one end thereof the collar 21, while the opposite end of said spring projects into a recess 31 at the inner end of the sleeve 27 and is seated against said sleeve, thereby yieldingly forcing said collar 21 and said sleeve 27 apart and straightening or tending to straighten the toggle 24, the result being to yieldingly retain said cylindrical member in its contracted relation to said carrier.

1' In the fore oing description, mention has been made of but one expansible member, but in Fig, 2 I have illustrated a pair of expansible cylindrical members arranged adjacent-opposite ends of the casing 5, said expansible members'being identical in construction and each contained in a recess 17, one of said recesses being formed in each end of the rotary member 4. This arrangement provides a more uniform adjustment or operating means for the pistons 11 provided they are operated simultaneously, and as a preferred means for simultaneously operating said toggles 24 and from the exterior of the casing 5, I have provided a lever 32 pivoted at 33 to the casing 5, said lever being pivotally connected at 34: to the outer end of the sleeve 27 toward the left hand end of the casing 5. The outer free end of the lever 32 is provided with a handle by which said lever may be rocked to reciprocate said sleeve 27 longitudinally of the shaft 6. The sleeve 27 at the opposite end of the casing 5 is connected to the lever "link 38 to the free end of the lever'32 adjacent to the handle thereof, consequently as said ,lever 32 is rocked in the direction of the. arrow d the sleeve 27 at the left of said casing will be reciprocated long1- tudinally of the shaft 6 inwardly. Said movement of the lever 32 also causes the lever 36 to be rocked in the direction of the arrow e? and consequently thesleeve27,

at the right-hand side of the casing 5, will also be reciprocated longitudinally toward the interior of said casing and thereby'si multaneously move the pivots 23 and 26 of the toggles 24 toward each other.'collapsing said toggle and causing the movable members 19 to be moved from'a position in which the peripheryof the member 19 is concentric with theaxis of the rotary 'member 1 into'a position eccentric thereto or to a position concentric with the inner wall 9 of the crescent shaped chamber 10, as illustrated in dotted lines Fig. 1, said movable member 19 being guided by the members 20 upon the stationary portion 18. The two positions mentioned relative to the member 19 are the positions in which the periphery of the member 19 is concentric with either the periphery of the rotary member or with the wall 9, the positions being the extreme positions thereof, but it is not always necessary for said member 19 toobe moved this entire distance, but may be moved to predetermined portions thereof for the purpose hereinafter set forth.

In the operation of the device either the 1 carrier 4 or the casing 5 may be rotated relatively to the other member, but preferably the carrier is the rotatable member, as hereinbefore stated, this being the normal operating condition of the device. When it is desired to check the rotary movement of said carrier the lever 32 is rocked upon its pivot to cause the sleeves 27 to move lengthwise of the shaft (3 toward the interior of the casing and by this movement the movable member 19 will be moved toward the position indicated in dotted lines, Fig. 1, a.

predeterminedamount or according to the checking power desired.

revolved with the carrier 4 in the direction of the arrow b engage the periphery of said member 19 and are forced outwardly to project to a greater or less degree beyond the periphery 8 of the carrier 4; as they pass through the chamber 10 and thereby By -the movement. of the member 19, the pistons 11 as they are engage the oil, or any other suitable fluid,-

contained within said chamber. Saidroil Cir or other fluid. will. be carried forward by the pro ecting portion of said blade and 'romprcssed owing to the eonligm'ation of the cl'nuuher 10, or it said blade is projecting; but slightly beyond said periphery the oil in advance thereof will escape to the rear of said blade with a consequent retardation of said rotary member or a sudden (bet-hing thereof according to the degree to which said piston is rojected.

in the d 'awings the oil shown filling the chamber l0 and this is the preferred arrangement, it may be desirable however to completely till the recesses 17 with oil in order toflinsure the chamber vlt) being always completely filled.

From the foregoing description it will be seen that simple and ellicient means are provided for arctanplishing the objects of the invention, but while the elements herein shown and described are well adapted to perform the functions set forth, it is olr v'ious that various minor changes may he made in the proportions, shape andar angemeat of the seve al parts, without depar- .ing from the spirit and scope of the invention as defined in the appended claims.

Having thus described my invention what I claim and desire by Letters Patent to secure is:

jl. -r\v b 'ake mechanism having, in co1nbination, a casing, a piston carrier, one of said members rotatable relatively to the other, said casing having a crescent shaped chamber formed outside of and adjacent to the periphery of said carrier, a, shaft to which said carrier is secured, said shalt be ing jonrnaled in said casing, a series of pistons warried by said carrier, means to non malty retain said pistons with their outer ends [lash with the periphery of said carrier, and means to more said pistons to project laterally from said carrier a 1'edet'e1'- mined distance into said chamber, said meansincluding a toggle.

2. A brake mechanism having, in combination, a casing, a piston carrier one of said members rotatable relatively to the other,

ber formed outside of and adjacent to the periphery ot saldmirrler, a shaft to which said warrier is secured,sa1d shattbemg1our- ,naled in said casing, a series of pistonscarried by said carrier, means to normally retain said pistons with their oliter ends llush within the periphery of said carrier, an expam-lihle cylindri ral member arranged within said casing substantially concentric with'the axis of said carrier, a collar loosely mounted on said shalt. a sleeve slidable lone'itudinally on said shalt a spring interposed between said collar and yieldiugly separate the'same, a toggle pivotally connected at one of its ends to said collar, said toggle being pivoted at its opsaid sleeve to posite end to said sleeva and at its middle to one portion of said expansible member, and means to rccipro :ate said sleeve on said shalt to collapse said toggle whereby said cylindrical member will be expanded.

3; In a b 'ake mechanisn'i a casing, a piston carrier arranged to rotate Within said 'asing, said casilre having a chamber formed therein at one side of and adjacent to the periphery' of said'carrier, a series of pistons carried by said :arrie and movable radially relatively thcreto,springs adjacent opposite inner ends of said pistons adapted to normally retain said pistons within the periphcry oli said carrier, expansible cylindrical members arranged within the opposite ends of said carrier, maans to yieldingly retain said cylindrical members contracted, and means adapted to sinmltaneously expand said cylindri all members to engage said pistons at opposite ends thereo't and move the same outwardly in said carrier during the rotary n'iovements of said carrier.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

' YVILLIAM P. COLLINS.

Witnesses:

SYDNEY E. Tan "T, LnoNaao A. POWELL. 

